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Neutron diffraction of ice in hydrogels.

Yurina Sekine1, Tomoko Ikeda-Fukazawa, Mamoru Aizawa

  • 1Quantum Beam Science Center, Japan Atomic Energy Agency , 2-4 Shirakata-Shirane, Naka-gun, Tokai 319-1195, Japan.

The Journal of Physical Chemistry. B
|August 27, 2014
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Summary

Deuterated poly-N,N,-dimethylacrylamide (PDMAA) hydrogels show ice formation below 250 K. Distorted ice structures indicate significant interactions between water and polymer chains in PDMAA hydrogels.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Physical Chemistry

Background:

  • Hydrogels are water-swollen polymer networks with diverse applications.
  • Understanding water behavior within hydrogels is crucial for their performance.
  • Poly-N,N,-dimethylacrylamide (PDMAA) is a common hydrogel material.

Purpose of the Study:

  • To investigate the structure and properties of water within deuterated PDMAA hydrogels.
  • To determine the conditions under which ice forms in PDMAA hydrogels.
  • To explore the interactions between water molecules and PDMAA polymer chains.

Main Methods:

  • Neutron diffraction was performed on deuterated PDMAA hydrogels.
  • Measurements were conducted across a temperature range from 10 to 300 K.
  • Diffraction patterns were analyzed to identify ice phases and structural parameters.

Main Results:

  • Diffraction peaks below 250 K confirmed the presence of ice within the hydrogels.
  • Observed ice exhibited altered lattice constants (a and c axes increased by ~0.3%) compared to hexagonal ice (Ih).
  • These findings indicate the formation of bulk, low-density ice with distorted lattice structures.

Conclusions:

  • Bulk low-density ice can form within PDMAA hydrogels.
  • Lattice distortions in the ice suggest significant interactions between water and PDMAA polymer chains.
  • These interactions are important for the chemical and mechanical properties of PDMAA hydrogels.